ML20086G960
| ML20086G960 | |
| Person / Time | |
|---|---|
| Site: | McGuire  |
| Issue date: | 07/12/1995 |
| From: | Mcmeekin T DUKE POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 95-002, 95-2, NUDOCS 9507170325 | |
| Download: ML20086G960 (3) | |
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Duk21%9er Campany T. C bid!rra hicGuire Nudear Generation Department Vice nesident 12700Hagers FerryRoad(MGon'P)
(704)8754800 Huntersville,NC280784935 (704)8754809 Fat HM ER DATE: July 12,1995 U.S. Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555
Subject:
McGuire Nuclear Station, Unit 2 Special Report No: 95-002 Problem,.inve.Stigation Process No.. 24/95,1104 Gentlemen:
Attached for your information is Special Report No.95-002 conceming a valid failure of
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Diesel Generator 2A due to failure of the turbocharger. This event and a subsequent I
Diesel Generator 2B turbocharger failure will be the subject of Licensee Event Report 369/95-03.
Very truly yours, M/KM T.C. McMeekin RJD/beb Attachment cc:
Mr. S.D. Ebneter INPO Records Center Administrator, Region 11 Suite 1500 U.S. Nuclear Regulatory Commission 1100 Circle 75 Parkway 101 Marietta St., NW, Suite 2900 Atlanta, GA 30339 Atlanta, GA 30323 Mr. Victor Nerses Mr. George Maxwell U.S. Nuclear Regulatory Commissien NRC Resident inspector Office of Nuclear Reactor Regulation McGuire Nuclear Station Washington, D.C. 20555 J.700 0 u
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6 9507170325 950712 PDR ADOCK 05000369 I
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B:L Walsh (EC11C)
Zack Taylor (CNS) i G.A. Copp (EC050) l J.l. Glenn (MG02ME) j.
P.R. Herran (MG01VP)
Cindy Davis (MG01CP)
J. E. Burchfield (ONS Reg Compliance)
G.H. Savage (EC06E)
G.B. Swindlehurst (EC11-0842) 1 M.S. Tuckman (EC07H)
R.F. Cole (EC05N) i R. M. Frye (EC05N)
Tim Becker (PB02L) l P.M. Abraham (EC081) i R. B. White (MG01VP) l j_
LV. Wilkie (ONO3SR)
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D.P. Kimball(CNOSSR)
NSRB Support Staff (EC05N) 1 Kay Crane (MG01RC)
Rich Casler (EC05N) p F
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DUKE POWER COMPANY McGUIRE NUCLEAR STATION SAFETY REVIEW GROUP SPECIAL REPORT l
Diesel Generator Special Report Due To A Valid Failure Of Diesel Generator 2A on June 12, 1995, As Documented On Problem Investigation Process (PIP) 2-M95-1104.
Special Report No:
95-002 Date of Report:
July 12,1995 On June 12,1995, Diesel Generator (DG) 2A was being run following maintenance using routine surveillance test procedure PT/2/A/4350/02A, Diesel Generator 2A Operability Test. The DG was i
approximately 20 minutes into a one hour operability run (start 1004). At approximately 1600 the turbocharger failed, as detected by excessive noise and vibration. The engine was subsequently secured. Unit 2 was in Mode 1, Power Operation, at the time of the failure.
This was the first Valid Failure in the last 20 Valid Tests and the fourth Valid Failure in the last 100 Valid Tests of DG 2A. On a Unit basis, this was the third Valid Failure in the last 100 Valid Tests of DGs 2A and 2B. Surveillance testing remains monthly per the requirements of Technical Specification 4.8-1 (Diesel Generator Test Schedule).
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Upon inspection, damage noted included a single ejected compressor impeller blade, a damaged compressor end bearing, and a damaged turbine end bearing. Prior to completing the final root cause analysis for DG 2A's failure, the DG 2B turbocharger suffered an identical failure during operation. A preliminary engineering analysis following this failure revealed a recent design change that added air assist nozzles which can cause individual impeller blades to reach resonance under the specified testing conditions.
Corrective actions as a result of the DG 2A turbocharger failure included the replacement of damaged components and retuming DG 2A to an operable status.
Additional information regarding this failure, the DG 2B turbocharger failure, and the impact on the Unit 1 DG turbochargers will be included in Licensee Event Report 369/95-03.
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